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Fix asan issue with transmuting invalid syscall number #3433

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Fix asan issue with transmuting invalid syscall number #3433

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2 changes: 1 addition & 1 deletion crates/libafl_asan/Justfile
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ test: test_asan

pretty_rust:
#!/bin/sh
MAIN_LLVM_VERSION=$LLVM_VERSION cargo run --manifest-path ../utils/libafl_repo_tools/Cargo.toml --release -- -v
MAIN_LLVM_VERSION=$LLVM_VERSION cargo run --manifest-path ../../utils/libafl_repo_tools/Cargo.toml --release -- -v

pretty_toml:
#!/bin/sh
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6 changes: 4 additions & 2 deletions crates/libafl_asan/src/host/linux.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
//! # linux
//! The `LinuxHost` supports the established means of interacting with the QEMU
//! emulator on Linux by means of issuing a bespoke syscall.
use core::mem::transmute;

use syscalls::{Errno, Sysno, syscall2, syscall3, syscall4};

Expand Down Expand Up @@ -83,6 +82,9 @@ impl LinuxHost {
const SYSCALL_NO: u32 = 0xa2a4;

pub fn sysno() -> Sysno {
unsafe { transmute(Self::SYSCALL_NO) }
let mut ret = Sysno::read;
let ptr = &mut ret as *mut Sysno as *mut u32;
unsafe { *ptr = Self::SYSCALL_NO };
ret
}
}
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